<template>
 <div>
 <div class="shopcart">
   <div class="shopcart-content" @click="toggleList">
     <div class="content-left">
       <div class="log-wrapper">
         <div class="logo" :class="{'highlight':totalCount>0}">
           <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
         </div>
         <div class="num" v-show="totalCount>0">{{totalCount}}</div>
       </div>
       <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
       <div class="shopcart-desc">另需配送费￥{{deliveryPrice}}元</div>
     </div>
     <div class="content-right" @click.stop.prevent="pay">
       <div class="pay" :class="payClass">
         {{payDesc}}
       </div>
     </div>
   </div>
   <div class="ball-container">
     <div v-for="ball in balls">
       <transition name="drop" @before-enter="beforeDrop" @enter="dropping" @after-enter="afterDrop">
         <div class="ball" v-show="ball.show">
           <div class="inner inner-hook"></div>
         </div>
       </transition>
     </div>
   </div>
   <transition name="fold">
   <div class="shopcart-list" v-show="listShow">
      <div class="list-header">
         <h1 class="shopcart-title">购物车</h1>
          <span class="empty" v-on:click="empty">清空</span>
      </div>
      <div class="list-content" ref="listContent">
         <ul>
            <li class="food" v-for="food in selectFoods">
               <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartbutton-wrapper">
                   <cartbutton  :food="food"></cartbutton>
                </div>
            </li>
         </ul>
      </div>
   </div>
   </transition>
 </div>

  <transition name="fade">
  <div class="list-mask" @click="hideList" v-show="listShow"></div>
  </transition>
 </div>

</template>

<script type="text/ecmascript-6">
  import Bscroll from 'better-scroll'
  import cartbutton from '../cartbutton/cartbutton.vue'
  export default {
    props: {
      selectFoods: {
        type: Array,
        default () {
          return [
            {
              price: 0,
              count: 0
            }
          ]
        }
      },
      deliveryPrice: {
        type: Number
      },
      minPrice: {
        type: Number
      }
    },
    data () {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          }
        ],
        dropBalls: [],
        fold: true
      }
    },
    computed: {
      totalPrice () {
        let total = 0
        this.selectFoods.forEach((food) => {
          total += food.price * food.count
        })
        return total
      },
      totalCount () {
        let count = 0
        this.selectFoods.forEach((food) => {
          count += food.count
        })
        return count
      },
      payDesc () {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice
          return `还差￥${diff}元起送`
        } else {
          return '去结算'
        }
      },
      payClass () {
        if (this.totalPrice < this.minPrice) {
          return 'no-enough'
        } else {
          return 'enough'
        }
      },
      listShow () {
        if (!this.totalCount) {
          this.fold = true
          return false
        }
        let show = !this.fold
        if (show) {
          this.$nextTick(() => {
            if (!this.scroll) {
              this.scroll = new Bscroll(this.$refs.listContent, {
                click: true
              })
            } else {
              this.scroll.refresh()
            }
          })
        }
        return show
      }
    },
    methods: {
      drop (el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i]
          if (!ball.show) {
            ball.show = true
            ball.el = el
            this.dropBalls.push(ball)
            return
          }
        }
      },
      beforeDrop (el) {
        let count = this.balls.length
        while (count--) {
          let ball = this.balls[count]
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect()
            let x = rect.left - 32
            let y = -(window.innerHeight - rect.top - 22)
            el.style.display = ''
            el.style.webkitTransform = `translate3d(0,${y}px,0)`
            el.style.transform = `translate3d(0,${y}px,0)`
            let inner = el.getElementsByClassName('inner-hook')[0]
            inner.style.webkitTransform = `translate3d(${x}px,0,0)`
            inner.style.transform = `translate3d(${x}px,0,0)`
          }
        }
      },
      dropping (el, done) {
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight
        this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0,0,0)'
          el.style.transform = 'translate3d(0,0,0)'
          let inner = el.getElementsByClassName('inner-hook')[0]
          inner.style.webkitTransform = 'translate3d(0,0,0)'
          inner.style.transform = 'translate3d(0,0,0)'
          el.addEventListener('transitionend', done)
        })
      },
      afterDrop (el) {
        let ball = this.dropBalls.shift()
        if (ball) {
          ball.show = false
          el.style.display = 'none'
        }
      },
      toggleList () {
        if (!this.totalCount) {
          return
        }
        this.fold = !this.fold
      },
      empty () {
        this.selectFoods.forEach((food) => {
          food.count = 0
        })
      },
      hideList () {
        this.fold = true
      },
      pay () {
        if (this.totalPrice < this.minPrice) {
          return
        }
        window.alert(`支付${this.totalPrice}元`)
      }
    },
    components: {
      cartbutton
    }

  }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .shopcart
    position: fixed
    left: 0
    bottom: 0
    z-index: 50
    width: 100%
    height: 48px
    /*background: #141d27*/
    .shopcart-content
      display: flex
      background: #141d27
      font-size: 0
      .content-left
        flex: 1
        .log-wrapper
          display: inline-block
          vertical-align: top
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          border-radius: 50%
          background: #141d27
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            text-align: center
            background: #2b343c
            &.highlight
              background: rgb(0, 160, 220)
            .icon-shopping_cart
              line-height: 44px
              font-size: 24px
              color: #80858a
              &.highlight
                color: #fff
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            text-align: center
            border-radius: 16px
            font-size: 9px
            font-weight: 700
            color: #fff
            background: rgb(240, 20, 20)
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4)
        .price
          display: inline-block
          vertical-align: top
          margin-top: 12px
          line-height: 24px
          padding-right: 12px
          box-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, 0.1)
          font-size: 16px
          font-weight: 700
          color: rgba(255, 255, 255, 0.4)
          &.highlight
            color: #fff
        .shopcart-desc
          display: inline-block
          vertical-align: top
          margin: 12px 0 0 12px
          line-height: 24px
          color: rgba(255, 255, 255, 0.4)
          font-size: 10px
      .content-right
        flex: 0 0 105px
        width: 105px
      .pay
        height: 48px
        line-height: 48px
        text-align: center
        font-size: 12px
        color: rgba(255, 255, 255, 0.4)
        font-weight: 700
        &.not-enough
          background: #2b333b
        &.enough
          background: #00b43c
          color: #fff


    .ball-container
      .ball
        position: fixed
        left: 32px
        bottom: 22px
        z-index: 200
        transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
        .inner
          width: 16px
          height: 16px
          border-radius: 50%
          background: rgb(0, 160, 220)
          transition: all 0.4s linear

    .shopcart-list
      position: absolute
      left: 0
      top: 0
      z-index: -1
      width: 100%
      transform: translate3d(0, -100%, 0)
      &.fold-enter-active, &.fold-leave-active
        transition: all 0.5s
      &.fold-enter, &.fold-leave-active
        transform: translate3d(0, 0, 0)
      .list-header
        height: 40px
        line-height: 40px
        padding: 0 18px
        background: #f3f5f7
        border-bottom: 1px solid rgba(7, 17, 27, 0.1)
        .shopcart-title
          float: left
          font-size: 14px
          color: rgb(7, 17, 27)
        .empty
          float: right
          font-size: 12px
          color: rgb(0, 160, 220)
      .list-content
        padding: 0 18px
        max-height: 217px
        /*width: 100%*/
        overflow: hidden
        background: #fff
        .food
          position: relative
          padding: 12px 0
          box-sizing: border-box
          border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height: 24px
            font-size: 14px
            color: rgb(7, 17, 27)
          .price
            position: absolute
            right: 90px
            bottom: 12px
            line-height: 24px
            font-size: 14px
            font-weight: 700
            color: rgb(240, 20, 20)
          .cartbutton-wrapper
            position: absolute
            right: 0
            bottom: 6px

  .list-mask
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: 40
    backdrop-filter: blur(10px)
    opacity: 1
    background: rgba(7, 17, 27, 0.6)
    &.fade-enter-active, &.fade-leave-active
      transition: all 0.5s
    &.fade-enter, &.fade-leave-active
      opacity: 0
      background: rgba(7, 17, 27, 0)
</style>
